Think this through, and then, if you still think it is a good idea, think it over again.
I picked up a registered APHA gelding, futurity eligible (now nominated), Breeders Trust (means he can win money) - cute little yearling for 800. No way you can breed one cheaper than what you can buy - and if all you want is a grade trail horse, you can pick one of those yearlings off of Craigslist or Dreamhorse for a couple hundred.Tops. Then you don't have to risk your mare's life, hope for a colored and healthy baby, then wait three years to ride (and that's if you put it under saddle as a 2 year old).
No reason AT ALL to breed grade horses. Especially not 14 hand appy ponies.
There is no passion to be found playing small - in settling for a life that is less than the one you are capable of living. - Nelson Mandela